Its strategical importance was one of the causes which led to the occupation of Tunisia by the French in 1881.
The city was founded in 1785 by Sir Guy Carleton, and made the capital of the province, in spite of the jealousy of St John, on account of its superior strategical position.
The number of field battalions was nearly doubled, two-thirds of the artillery received breech-loading rifled guns, the infantry had for some years had the breech-loading "needlegun," and steps were initiated to train an adequate number of staff officers to a uniform appreciation of strategical problems, based on Moltke's personal interpretation of Clausewitz's Vom Kriege.
The only chance of the invaders achieving their object after the first week of land fighting depended on their being joined by very substantial additional forces in a region where a belligerent fighting on the defensive in home territory, as the Osmanlis were, enjoyed marked strategical and tactical advantages.
In the wars of 1848 and 1864 Schleswig was an important strategical point on account of its proximity to the Dannewerk and was occupied by the different contending parties in turn.