In a hopeless battle, the valiant fight put up by your division is highly regarded.

Literal

Hopeless battle [possessive-の] among, your-honor [possessive-の] division [subject-が] fought-well [nominalizer-こと][topic-は] highly evaluated-[passive-されている].

絶望的な戦い 'a hopeless/desperate battle.' 貴君 'you' — a formal/military honorific for an equal or junior. 師団 'division' (military unit). 善戦した 'fought well/valiantly.' 高く評価されている 'is highly evaluated' — passive present for an ongoing assessment. Military formal register.