attack: oppugno, -āre, -āvi, -ātum
avail: valeō, -ere, -ui, valitūrus.
call (name): appellō, 1
changeable: mobilis
choose: dēligō, -ere, -lēgī, lēctus,
circumstance: rēs, reī, f.
comrade: commīlitō, -ōnis, m.
courageous: fortis
cross: trānseō, -īre, -iī, -itus
embankment: agger, -eris, m.