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.

Definitions of harry

v make a pillaging or destructive raid on (a place), as in wartimes

Type of:
destroy, ruin
destroy completely; damage irreparably

v annoy continually or chronically

“He is known to harry his staff when he is overworked”
beset, chevvy, chevy, chivvy, chivy, harass, hassle, molest, plague, provoke
show 7 types...
hide 7 types...
goad, needle
goad or provoke,as by constant criticism
bedevil, crucify, dun, frustrate, rag, torment
treat cruelly
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
annoy persistently
oppress, persecute
cause to suffer
Type of:
annoy, bother, chafe, devil, get at, get to, gravel, irritate, nark, nettle, rag, rile, vex
cause annoyance in; disturb, especially by minor irritations