It'll render him near-invincible for several days.
This proved to be the last pitched battle of the war, the Danes never again venturing to attack their once more invincible enemy in the open field.
He is constantly admitting that on such and such an occasion he was terribly afraid; he confesses without the least shame that, when one of his followers suggested defiance of the Saracens and voluntary death, he (Joinville) paid not the least attention to him; nor does he attempt to gloss in any way his refusal to accompany St Louis on his unlucky second crusade, or his invincible conviction that it was better to be in mortal sin than to have the leprosy, or his decided preference for wine as little watered as might be, or any other weakness.
Rome, protected by invincible prestige, escaped.
They knew well enough the power of invincible Rome; and her advance warned them to take themselves and their talents to the market of the wide world, to which in heart and mind they had always belonged.