Chalk one up to Ballistae! At last, the tide is turning in our favour again.
I was thinking: if I were Arstotzkan, I'm probably reading a report from my theatre commander saying "We need to do something about these bloody ballistas!
*". And then I'd probably think, hmm, ballistas are made of wood. We have fireballs. What if we just made those fireballs have a longer range?
If I am correct, then we should preempt this development. If I'm wrong, well, making our ballistae have an even longer range won't hurt us. My suggestion is to use our revision to place wind-magic enchantments on a ballista (with an attendant wizard to maintain them) which grants the projectiles longer range.
Either that or we make them cheaper, so that even if a few get destroyed there are still enough to rain havoc down upon the enemy.
(Or we upgrade ballistae in the design phase)
For our design... I could go for Theoretical Summoning. Though the first thing I'd want to summon would be storm elementals, not pegasi.
I could also go for a new ship. If we can take the western seas, we can land troops behind the enemy, disrupting their supply lines. I'd want something like this:
War Galley: Larger and stronger than our sailing ships, war galleys are propelled by a combination of sails and oars- oars which are manned by banks of volunteers from the plains- to give the larger craft a decent degree of mobility. Their main weapon is a large ram on the front of the ship, which can split enemy longships in half. They also have room for a decent number of troops, should the opportunity to conduct landing operations ever come up.
The combination of the light, agile sailing ships, combined with the powerful war galleys, should give us the tactical flexibility needed to deal a decisive blow to the Arstotzkan navy.
Though actually, I could also go for a better ballista as a design. I mean, they gave us the big push we needed to win this year, why not improve upon them? I like the suggestion for
Gale Stones (Enchanted Ballista Ammunition): These represent a revolution in killing devices. Rather than being spherical, they are shaped like pointed helmets, which makes them more aerodynamic, increasing their natural accuracy. That's mostly an aesthetic change compared to their main feature; an enchantment cast upon them that causes them to shatter on impact, releasing hurricane-esque winds, and sending shards of rock flying through enemy soldiers. They also have a secondary enchantment which ensures the wind always blows in their favour, increasing their speed and range.
It may not be fire, but the explosive power is the same. These will devastate enemy infantry, ships, and fortifications, as the gusts of wind and shards of rock rip through them.
These may be expensive, but given that ballistae are already Very Expensive, a shortage of ammunition is unlikely to come up.
I'm going to vote for that, I think. (also, Devastator said he was still voting for Gale Stones)
Mindwashing: (1) Crazyabe
Gale Stones: (3) Madman198237, Devastator, NUKE9.13
Greek Fire bolts: (1) S34N1C
Theoretical Summoning: (2) Egan, Happerry
Weapon & Armour Enchantments: Taricus
EDIT: For the revision credit, we could really use it, so I think we should send one unit of troops, along with a herd of horses and a whole bunch of compound bows. Our troops can teach theirs how to be horse archers. That'll be a nasty surprise for their enemies.