No, You need to load a single packet and hit the structure with it. The book actual states
5 direct hits from a Heavy catapult/trebuchet throwing a single projectile will destroy a wooden building and 10 direct hits will destroy a stone building.
Wayne O
The Game Master Lite
Frag the weak, Hurdle the dead!
At first was like, why would life decrease load time... HP = hero points
hmm... instantly loading a catapult seems kinda stupid. Course so does instantly bonding someone. Mayhaps hero points shouldn't work on non-skill based times?
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