# When they took hold of you in their hand

"When they relied on you"

# When they took hold of you

This refers to the Israelites and the word "you" refers to Pharaoh or Pharaoh and Egypt.

# you caused their legs to be unsteady

"you caused them to be like people whose legs are unsteady". Because Egypt did not help the Israelites, the Israelites could not defend themselves against their enemy, the Babylonians.