I guess now it would be kinda useful to know Old English 😛 😆
And I don't 😛
but here a lil maybe useful vocabulary... I don't know any words for "cage" itself but found those for "prison" or "enclosure" - carcærn, clús, clústor, hlínræced, néadcofa, nýdcleofa, nearu, nirwð
I think "nearu" would be the most useful as it's short, but still beautiful... the accusative (direct object) of it should be neare?
For "break" (<breaker) I also found loads of words....brecan, ábrecan, áberstan escape, ábéatan and several ones like that, I think here "áberstan" is the one that could be used... (btw, "breaking" is "gebryce" 😑 )
participe present maybe ?áberstennen
Breaker = Brecan?
"brave" (in battle) would be níðheard; hence, hm, Níðhearded?
edit - ok too late 😛
cafig? - in german it's Käfig 😛