Wouldn't the army have flasks of alchemist's fire or acid?
Same thing as the caster v. non-caster thread: need to define parameters before this has any significant meaning.
Here's what I propose -
Army: 5000 strong, each with at least 5' spacing between them on average.
20% are archers (ave Dex of 14, each w/ 2 quivers, can use crossbows too)
30% are spearmen (or 2-handed reach weapon non-shield users, ave Str of 14)
30% are sword 'n board (or 2-handed non-reach melee users, ave Str of 14)
20% are specialty (a schmattering of casters, siege weapon operators, and scout types)
None are > L3. On average, only the specialty characters will have acid flasks et al (and less than 10 each), and then only the scout types will have more than 5.
How does that sound?