At an early age, as already stated, she expressed a wish to be a missionary to the heathen, and the wish grew stronger with increasing years. But suddenly it became evident to her that there was plenty of work waiting for her close at hand. 'Sinners perishing all around me,' she wrote in her journal, 'and I almost panting to tell the far heathen of Christ! Surely this is wrong. I will no longer indulge the vain, foolish wish, but endeavour to be useful in the position where Providence has placed me. I can pray for deluded idolaters and for those who labour among them, and this is a privilege indeed.' She began at once to take an active part in local mission work; but while thus employed her interest in foreign missions did not diminish, and the death of the two young missionaries, Wheelock and Colman, who went to Burma to assist Mr. Judson, made a deep impression on her. Wheelock, while delirious from fever, jumped into the sea and was drowned, and Colman, after a time, died at Arracan from the effects of the unhealthy climate. On hearing of Colman's death she wrote 'Lines on the death of Colman,' the first verse of which is:—

'Tis the voice of deep sorrow from India's shore,
The flower of our Churches is withered and dead,
The gem that shone brightly will sparkle no more,
And the tears of the Christian profusely are shed.
Two youths of Columbia, with hearts glowing warm,
Embarked on the billows far distant to rove,
To bear to the nations all wrapped in thick gloom,
The lamp of the Gospel—the message of love.
But Wheelock now slumbers beneath the cold wave
And Colman lies low in the dark, cheerless grave,
Mourn, daughters of India, mourn!
The rays of that star, clear and bright,
That so sweetly on Arracan shone,
Are shrouded in black clouds of night,
For Colman is gone!

These lines were read by George Dana Boardman, a young man, twenty-four years of age, who had just been appointed to succeed Colman at Arracan. He obtained an introduction to Sarah Hall, and in a short time they became engaged. They were married on July 3, 1825, and thirteen days later sailed for Calcutta, where they landed on December 2. The war in Burma prevented their proceeding to Rangoon, so they settled down at Calcutta, to study the Burmese language with the aid of Mr. Judson's books. At this they were engaged almost continuously until the spring of 1827, when they sailed for Amherst, in Tenasserim, a newly built town in the recently acquired British territory, to which Mr. Judson had removed with his converts soon after the conclusion of the war.

The Boardmans' stay at Amherst was, however, short. Towards the end of May they were transferred to another new city—Moulmein. A year before their arrival the place had been a wide expanse of almost impenetrable jungle; now it had 20,000 inhabitants. Wild beasts and deadly snakes abounded in the jungle around the city and, across the river, in the ruined city of Martaban, dwelt a horde of fiendish dacoits, who occasionally made a night raid on Moulmein, robbing and murdering, and then hurrying back to their stronghold. The Boardmans had been settled in their bamboo hut barely a month when they received a visit from the dacoits. One night Mr. Boardman awoke, to find that the little lamp which they always kept burning was not alight, and suspecting that something was wrong he jumped out of bed and lit it again. The dacoits had entered, and stolen everything they could possibly carry off. Looking-glasses, watches, knives, forks, spoons, and keys had all disappeared. Every box, trunk, and chest of drawers had been forced open, and nothing of any value remained in any of them. This was the first home of their own that the Boardmans had ever had, and to be robbed so soon of practically everything they possessed was indeed hard. They had, however, the satisfaction of knowing that the dacoits had not, as usual, accompanied robbery with murder. But that the dacoits would have murdered them had they awoke while they were plundering was plain. Two holes had been cut in the mosquito curtain near to where Mr. and Mrs. Boardman and their one-year-old child lay, and by these holes dacoits had evidently stood, knife in hand, ready to stab the sleepers if they awoke. It was a great shock to Mrs. Boardman, who was in bad health, but soon she was joining her husband in thanking God for having protected them.

After the robbery the officer commanding the British troops stationed two sepoys outside the mission house, and some idea of the dangers which surrounded the Boardmans may be formed from the fact that one day the sentry was attacked by a tiger.

But, exposed as the Boardmans were to perils of this kind, they continued their work among the rapidly increasing population, and met with considerable success. Many native Christians, converted under Mr. Judson at Rangoon, lived at Moulmein, and consequently the Boardmans' work was not entirely among the unconverted. Indeed, before long nearly all the native Christians in Burma were residing at Moulmein, Amherst having declined in public favour. When the majority of the inhabitants of Amherst migrated to Moulmein the missionaries accompanied them, and soon nearly all the missionaries to Burma were working in one city. Neither the missionary board in America nor Mr. Judson considered this to be wise, and some of the missionaries were removed to other places, Mr. and Mrs. Boardman being sent to Tavoy, some 150 miles south of Moulmein. The dialect of the people of Tavoy differed considerably from Burmese, and the Boardmans had practically to learn a new language. As the written characters of both languages were the same, the task was not very difficult, and before long the missionaries were preaching the Gospel to the Tavoyans.

Soon after they had settled down some Karens invited Mr. Boardman to visit them. Their country was not far away, but the missionary could not as yet leave Tavoy. The Karens, however, told him something that excited his curiosity. A foreigner passing through the land had given them a book, and told them to worship it. They had done so. A high-priest had been appointed, and he had arranged a regular form of worship, Mr. Boardman asked the Karens to let him see the book, and they promised to bring it to him. Soon a deputation, headed by the high-priest, attired in a fantastic dress of his own designing, arrived at Tavoy with the book, which was carefully wrapped up and carried in a basket. On having the book handed to him Mr. Boardman saw that it was a Church of England Prayer-book. He told the Karens that although it was a very good book it was not intended to be worshipped, and they consented to give it to him in exchange for some portions of Scripture in a language they could read. It was never discovered who gave the Prayer-book to the Karens, but it may be taken for granted that they misunderstood the donor's meaning. This book was afterwards sent home to the American Baptist Missionary Society.

On July 8, 1829, Mrs. Boardman was plunged into grief by the death of her little daughter, aged two years and eight months. Other troubles followed quickly. One night Mrs. Boardman was awakened by hearing some native Christians shouting, 'Teacher, teacher, Tavoy rebels!' The inhabitants of Tavoy had revolted against the British Government, and had attempted to seize the powder magazine and armoury. The Sepoys had driven off the rebels, who were, however, far from being disheartened. They burst open the prison, set free the prisoners, and began firing on the mission house. Bullets passed through the fragile little dwelling-place, and the Boardmans would soon have been killed had not some Sepoys fought their way to their assistance, with orders to remove them to Government House. As Mrs. Boardman with her baby boy in her arms hurried through the howling mob of rebels she had several narrow escapes from being shot, but fortunately the whole of the little party from the mission house reached Government House in safety. The Governor of Tavoy was away when the rebellion broke out, and as the steamer in which he had departed was the only means of rapid communication between Tavoy and Moulmein, the little British force settled down to act on the defensive until reinforcements arrived. Soon it was found that Government House would have to be evacuated, and eventually the British and Americans took shelter in a six-room house on the wharf. In this small house the whole of the white population, the soldiers, and the native Christians were sheltered. The rebels, strongly reinforced, attempted to burn them out, but a heavy downfall of rain extinguished the flames before much harm had been done.

At last, to the great relief of the defenders, the governor's steamer was seen approaching. The governor was considerably surprised to find the natives in revolt. Immediately after his arrival he sent his wife and Mrs. Boardman aboard the steamer, which was to hurry to Moulmein for reinforcements. Mrs. Boardman begged to be allowed to remain and share the danger which was threatening both the whites and the native converts, but the governor firmly refused to allow her to do so.

As soon as the rebellion was quelled Mrs. Boardman returned to Tavoy and resumed her work, but troubles now came upon her quickly. On December 2, 1830, her baby boy died, making the second child she had lost within twelve months. Her husband, too, was in very weak health, although still working hard. On March 7, 1831, he reported that he had baptized fifty-seven Karens within two months, and that other baptisms would soon follow. But the latter he did not live to see, for he died of consumption three weeks after writing his report.