I can confirm this. I had to lead Enweil's archer heavy army against Riombara and we still managed to repel Riombara, even when we had 3k less than them. But mostly the weather in BM isn't so great. I'd rather invest in getting cavalry units and constantly repeat charge/retreat tactic.
It's not just the army composition, though, it's also the line settings both sides use.
When I was Enweil's general, I optimized the line settings according to what we had, what the enemy had, and what we knew the enemy liked to use, which helped us do better with less (overall, mostly just helped compensate for sub-par movement rates though).
On the other hand, you could have a lot of archers, good weather, more CS than the enemy, and still get stomped, if you use poor settings and the enemy uses good ones. I like archers, but overall, infantry-heavy armies tend to be a lot more reliable imo.
