It was soon after this battle that Columcille decided to leave Ireland. There is a great deal of evidence that he did so as a kind of penance, either self-imposed or enjoined upon him by St. Molaíse [Moleesha], as Keating says, or by the "synod of the Irish saints," as O'Donnell has it. He had helped to fill all Ireland with arms and bloodshed, and three thousand men had fallen in one battle largely on account of him, and it was not the only appeal to arms which lay upon his conscience.[17] He set sail from his beloved Derry in the year 593, determined, according to popular tradition, to convert as many souls to Christ as had fallen in the battle of Cooldrevna. Amongst the dozen monks of his own order who accompanied him were his two first cousins and his uncle.
It was death and breaking of heart for him to leave the land of Erin, and he pathetically expresses his sorrow in his own Irish verses.
"Too swiftly my coracle flies on her way,
From Derry I mournfully turned her prow,
I grieve at the errand which drives me to-day
To the Land of the Ravens, to Alba, now.
* * * * *
How swiftly we travel! there is a grey eye
Looks back upon Erin, but it no more
Shall see while the stars shall endure in the sky
Her women, her men, or her stainless shore.
From the plank of the oak where in sorrow I lie,
I am straining my sight through the water and wind,
And large is the tear of the soft grey eye
Looking back on the land that it leaves behind.
To Erin alone is my memory given,
To Meath and to Munster my wild thoughts flow,
To the shores of Moy-linny, the slopes of Loch Leven,
And the beautiful land the Ultonians know."
He refers distinctly to the penance imposed upon him by St. Moleesha.
"To the nobles that gem the bright isle of the Gael
Carry this benediction over the sea,
And bid them not credit Moleesha's tale,
And bid them not credit his words of me.
Were it not for the word of Moleesha's mouth
At the cross of Ahamlish that sorrowful day,
I now should be warding from north and from south
Disease and distemper from Erin away."
His mind reverts to former scenes of delight—
"How dear to my heart in yon western land
Is the thought of Loch Foyle where the cool waves pour,
And the bay of Drumcliff on Cúlcinnê's strand,
How grand was the slope of its curving shore!
* * * * *
O bear me my blessing afar to the West,
For the heart in my bosom is broken; I fail.
Should death of a sudden now pierce my breast
I should die of the love that I bear the Gael!"[18]
Columcille is the first example in the saddened page of Irish history of the exiled Gael grieving for his native land and refusing to be comforted, and as such he has become the very type and embodiment of Irish fate and Irish character. The flag in bleak Gartan, upon which he was born, is worn thin and bare by the hands and feet of pious pilgrims, and "the poor emigrants who are about to quit Donegal for ever, come and sleep on that flag the night before their departure from Derry. Columcille himself was an exile, and they fondly hope that sleeping on the spot where he was born will help them to bear with lighter heart the heavy burden of the exile's sorrows."[19] He is the prototype of the millions of Irish exiles in after ages—
"Ruined exiles, restless, roaming,
Longing for their fatherland,"[20]