If they refuse to make peace and they engage you in battle, lay siege to that city.
NMVAnd if it will make no peace with youi, but will make war against youi, then youi shall besiege it:
OJBAnd if it will make no shalom with thee, but engages in milchamah against thee, then thou shalt besiege it;
Onkelos (Etheridge)But if it will not make peace with thee, but will have war with thee, then thou shalt besiege it:
T4TBut if they refuse to surrender peacefully, and decide instead to fight against you, your troops must surround the city and break through the walls.