The troops of the National Defence Corps were scattered about the various sectors of the front to complete their training under the ægis of French units. As their training progressed, they were incorporated into ever larger units, so that whereas at first each Greek company was placed between companies belonging to other armies, later they were grouped in battalions, then in regiments, and finally in divisions. For a time there was one Greek division on the Monastir front, and one with the I Group of Divisions west of the Vardar; later on, two were grouped together, and early in 1918, all three were united in the latter sector, thus constituting a complete army corps. Until that moment the Greek Command was a Corps Command, under General Zimbrakakis, with its G.H.Q. at Salonica, and later at Boemitza, near front of the I Group. The latter, however, continued to be commanded by a French General--first General Gérome, and then General d’Anselme. In the late autumn of 1917, detachments of the Greek Regular Army began to reach Salonica. Their training was divided into three periods--the first in Old Greece, the second at the training camp at Naresh, near Salonica, and the third in a quiet sector of the front. The last detachments did not reach Macedonia until the eve of the offensive of September, 1918. The 1st, 2nd and 13th Divisions composed the I Army Corps; the others were not embodied in corps until after the Armistice, but served under Allied units in different sectors. To the I Corps (Gen. Paraskevopoulo) was entrusted the lower Struma area in the summer of 1918, at first under the command of the British XVI Corps, and subsequently directly under the British G.H.Q.