The capture of Adrianople, followed by other conquests, brought about a coalition under the king of Hungary against Murad, but his able lieutenant Lalashahin, the first beylerbey of Rumelia, defeated the allies at the battle of the Maritsa in 1363.
On the right of the Maritsa, and the 9th on the left, seized Mustafa Pasha, continuing their progress on the loth.
It was naturally divided by its four water-courses (Upper Maritsa, Arda, Lower Maritsa, Tunja) into four sectors.
On the Lower Maritsa-Tunja sector the 3rd Div.
Army was advancing on the Tunja-Upper Maritsa, the 8th Div.