# The bows of the mighty men are broken

"Mighty bowmen are kept from acting"

# The bows of the mighty men are broken

"Yahweh breaks the bows of the mighty men" or "Yahweh can make even the strongest of people weak" 

# those who stumble are girded with strength

"he will make those who stumble strong"

# are girded

They have put something around their waist to prepare for work.