Have fallen at their feet

The following context is describing this piece.

1. Does the green section mean "they move to the top of the block in three lines"?

2. Does the orange sentence mean "Their wounded enemies have lied under their feet" or "Their wounded enemies are begging them to survive"?

Context:

The Victory Stele of Naram-Sin in the Louvre in Paris depicts Sargon’s grandson leading his armies up a mountain. They diagonally criss-cross the two-metre-high sandstone block (possibly a memorial) three times, led by their exceptionally large horn-helmeted leader. Their wounded enemies have fallen at their feet.