Apparently, the biggest army Spain fielded during the Peninsular War was that commanded by Areizaga at Ocaña. This produced a very enjoyable game for us. It's a nice asymmetric match-up of French quality against Spanish quantity: a French army is outnumbered 3:2 but has to attack, which makes for interesting tactical challenges for both sides. Photo-AAR on the BBBBlog here:
https://bloodybigbattles.blogspot.com/2025/06/spains-biggest-peninsular-war-battle.html