OPERATIONS.
The operations of the landed expedition corps on the whole can be conducted according to the principles set down by the commanders of the troops, but these principles must take into account the particular conditions under which the forces operate. The well-known marine writer, Mahan, emphasizes the fact that a landing operation must be offensive to succeed. Military history shows that after boldly carried out landings at Abukir and Cape Breton, for example, the success of the extensive operations was impaired, almost lost, because of lack of energy and rapidity of execution of offensive movements. The assembled strength must be thrown forward on the line of least resistance. Defensive strategy should be used only when a delay is necessary to receive expected reenforcements. The primary aim of the operations is to dispose of hostile forces, within the shortest possible time and with the least loss to ourselves.
During the progress of the operations the country through which the troops pass can be drawn upon to supplement equipment and supplies, but the speed of the advance and the efficiency of the troops must not be decreased through extended raids. While the distance to the objective of the invasion is generally not great, it should be our endeavor to be independent of our base of supplies. Much progress has been made in the methods of making condensed foods, for man and horse, which will help to solve the problem of provisions. The army of invasion can also take an important site in the hostile country and utilize it as a base of operations. Continuous communication with the home country is therefore not absolutely necessary. In a densely populated and rich country it is easy to secure provisions and supplies. The maintenance of long lines of communications is hazardous in that it requires excessive guard duty. When the battle fleet has gained command of the sea it will be in a position to protect continuously the base on the coast, and would also make it possible for the corps of invasion to select new bases. Sherman's march to Savannah in the Civil War has shown the practicability of this plan. After one objective has been attained, it should be possible for the expedition to reembark to land at some other point on the coast for further operations.
Against the enemy's defenses we must throw our full strength and avoid enterprises that involve a delay or a weakening of our forces. Dearly purchased victories will in the end defeat our own aims.
If the operations of the troops are carried on along the coast, or if the objective of the operations is a harbor or a coast fortification, the battle fleet should act in unison with the land forces. Battleships are superior to the field artillery, as they can be moved at will and so are hard to put out of action. Continuous bombardment from the battleships would prove effective aid for the troops.
It is important, then, that the command of land and naval forces be joined in a commander-in-chief who would direct the field forces as well as the naval forces. Small coast defenses of seaport cities could not for any length of time withstand such a combined attack. It is certain also that present-day coast defenses could not withstand an energetic attack from the land side. They are more vulnerable than inland fortresses because they are open to attack simultaneously from land and water. However, if the battle fleet cannot gain the command of the sea, and must retreat before the opposing forces, the operations of the landed troops must be conducted wholly as a war on land.
REEMBARKATION.
A reembarkation of the expedition corps is possible only when the battle fleet is able to prevent attack from the sea. In the event of defeat on land, reembarkation is not absolutely impossible, for if good order is maintained the improvised defenses of the landing sites, with the help of the fleet, will sufficiently delay the pursuers. If the reembarking must take place from some other point, preparations for its defense must be made in advance. When the reembarkation is done with the aim in view of attacking at another place, the rules as explained in the chapter on "Embarkation" must be adhered to. For such an operation, more time is essential, and pressure of the enemy should not be permitted to interfere with its management.