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A scaling tower and scaling ladder are both used to scale walls. A scaling tower is better though
A SCALING LADDER
A SCALING TOWER
A BATTERING RAM
A LONGBOW
A CATULPULT
ALL OF THESE WERE USED TO ATTACK CASTLES
Scaling- when you multiply or divide equivalent fractions
The scaling factor is 9/3 = 3
a scaling tower with a battering ram attached to it