[quote=@Hael]
<Snipped quote by Voltus_Ventus>

Maybe. But any type of balloon in a battlefield would be much, much less safe than a more conventional aircraft. It may not be entirely vulnerable, but not nearly as practical . 
[/quote]

Suspended reality. Outcomes of battles aren't represented by your tech or rolls or numbers, you make up the outcome and that could mean airships lose and it could mean they win. It's your choice.