Psaume 147:10 (NEG79)

10 Ce n'est pas dans la vigueur du cheval qu'il se complaît,Ce n'est pas dans les jambes de l'homme qu'il met son plaisir;

In a war, a strong horse was important. And a soldier must have sturdy legs, for running fast or walking long distances belong to the basic skills of a soldier. Even now, good shoes or boots are basic equipment for a soldier, but for God, cavalry or infantry does not matter. God often uses those who are weak in this world as his instruments.