The general shape of <a class="linkToPlace" target="_blank" href="/place?placename=Sparta&groupId=660&placeId=1208">Sparta</a> is a circle; it lies in a country level on the whole but here and there with certain irregularities and hills.
The river that runs past it on the east is called the Eurotas, and is usually too deep to be forded.
The hills on which the Menelaïum stands are on the far side of the river to the south-east of the town, and are rocky, difficult to ascend, and of considerable height.
They absolutely command the level space between the city and the river, which runs close along their foot, its distance from the city being not more than a stade and a half.
It was along there that Philip was forced to pass in his retreat with the town on the left hand and the Lacedaemonians drawn up outside it ready for him, and with the river on his right and across it Lycurgus' force posted on the hills.
The Lacedaemonians had contrived still further to strengthen their position by damming the river higher up and making it overflow all the ground between the town and the hills, over which, when thus soaked, it was impossible even for the infantry to pass, not to speak of the cavalry.
Thus the only passage left for the army was close along the foot of the hills, which would expose them on the march to the enemy in a long narrow column, no part of which if attacked could expect support from the rest.
Philip, taking this into consideration and having consulted his friends, decided that the most immediate necessity was to drive Lycurgus away from the neighbourhood of the Menelaïum.
Taking therefore his mercenaries, peltasts, and Illyrians, he crossed the river and made for hills.
Lycurgus, seeing what Philip had in view, got the men he had with him ready and addressed them in view of the approaching battle, and at the same time signalled to those in the town,
upon which the officers in command there at once led out the troops, as had been arranged, and drew them up in front of the wall, placing the cavalry on the right wing.
Walbank Commentary