Road Checkpoint

We remained in hiding all morning, hidden behind a rock and a few bushes, observing the routines of the bad guys who controlled the road from those fortifications.
They had been clever; from there they could control the main road; the rock faces and the river allowed no other place to advance than that stone bridge.
And they kept a close watch on it.
But we figured out how to attack them; during their guard shift, the bridge would be unguarded for about a minute.
That was our chance.