Wheelock answer is : Iussit eos defendere rem publicam periculo. I wrote: Iussit eos rem publicam periculo defendere. Does my translation contain ambiguity because two accusatives are placed next to each other? Also what about: Eos rem publicam periculo defendere iussit?
I don’t see any ambiguity. Technically either accusative could be the object of iussit, but in having “rem publicam periculo” together implies that it’s the republic that’s being modified by the ablative of separation here.