They will be one more army vanquished among the many routed hordes.
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (a defeated) and slain (host are (all) the factions) of disbelievers: the disbelievers of mecca (that are there) they were defeated and killed on the day of badr when they intended to kill the prophet (pbuh).
Jalāl al-Dīn al-Maḥallī
تفسير : a routed (mahzūmun is an adjectival qualification of jundun, ‘host’) host [is all that they are], in other words, they are [nothing but] a despicable host, nothing more — in their denial of you — from among the factions (mina’l-ahzābi, also an adjectival qualification of jundun) in other words, [they are] like those hosts of factions who were in confederation against prophets before you: these were defeated and destroyed, and likewise we shall destroy these [people].