腹がへっては戦ができぬ。

abdomen; belly; stomach; womb; one's mind; one's real intentions; one's true motive; courage; nerve; willpower; generosity; magnanimity; feelings; emotions; wide middle part; bulging part; inside; interior; inner part; anti-node; counter for hard roe; counter for containers with bulging middles (pots, vases, etc.)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

to pass; to elapse; to go by; to pass through; to go through; to experience; to go through; to undergo

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

to rustle; to sway; to stir; to flutter

to be able (in a position) to do; to be up to the task; to be ready; to be completed; to be made; to be built; to be good at; to be permitted (to do); to become intimate; to take up (with somebody); to grow; to be raised; to become pregnant