旗本 はたもと はち まん だったら
hatamoto hachimankidattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 旗本八万騎

1. If/When [it] were the 80,000 banners/retainers…; If [it] had been the 80,000 banners/retainers…

Tara Conditional