Civ 4 is definitely bugged with Catapult vs. Scout
Test game:
Outside our borders, Catapult vs. Scout = 1 Great General xp
Inside our borders with Great Wall, Catapult vs. Scout = 3 Great General xp
Does retreating after an attack count as 0.5 Great General Xp? heh
@LowtherCastle and @Dhoomstriker have broken the game with this little idea.
3GG xp each turn is outrageous.
Test game:
Outside our borders, Catapult vs. Scout = 1 Great General xp
Inside our borders with Great Wall, Catapult vs. Scout = 3 Great General xp

Does retreating after an attack count as 0.5 Great General Xp? heh
There’s always the Dhoom Gambit of using an SB scout to harvest cat or treb xp. Once attacked (but not killed) the scout will remain stationary to heal so it can be attacked by our seige every turn.
Incidentally, an excellent variant is to gift a scout at the border pre-DoW for instant xp. There’s no limit to how many scouts you can gift — you can havest xp for your stack of 4 or 7 cats. Of course the AI can disband them IT.
Come to think of it, also a way to neutralize a scout so it doesn’t stand on our resource tiles
@LowtherCastle and @Dhoomstriker have broken the game with this little idea.
3GG xp each turn is outrageous.