When one army sends raiding parties into another's territory, they're harrying them. They're not making an all-out attack, they're just trying to bother and distract the other army.
Although harry is not a word you hear commonly now, it does frequently occur as harried — which is an adjective used to describe what it feels like to be asked for things from all sides. You might feel harried during final exams, or two days before Christmas, if you haven't yet started your shopping.
v annoy continually or chronically
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goad or provoke,as by constant criticism
bedevil, crucify, dun, frustrate, rag, torment
harass by imposing humiliating or painful tasks, as in military institutions
drive up the wall; go on someone's nerves
make ineffective or powerless
badger, beleaguer, bug, pester, tease
cause to suffer