All I can really comment on is the Great Spear, which is to say that there should be no difficulty in using it at all 2-handed from horseback. You wouldn't really couch it like you would a jousting lance. You just have to strap a buckler (can't use a larger shield) to your upper forearm if you want to fend off arrows. Scytho-Sarmatian Cataphracts fought this style and it was carried over by the Huns, Eastern Romans, Sassanid Persians and numerous other cultures in the Migration Era. They had what was called the contarius, which was basically a pike and used it quite effectively from horseback. Interestingly, the illustration of the Leofrings found on pg. 55 of The Heart of the Wild shows one of the horsemen using what looks quite a bit like a contarius.Láthspell wrote:First: Regarding Mounted Combat and Great weapons.
It seems to me, that such weapons as the Great Bow, Great Axe, Mattock, and the Great Spear (though given the background of the Giant-slaying Spear, it is possible that a jousting lance would qualify as a great spear) would be unwieldy on horseback. What would be people's thoughts on heroes wielding such weapons counting as hindered? With the possible caveat that characters with Horsemanship are considered comfortable enough in the saddle to ignore the penalty.
The other weapons, as far as I know, cannot be used from horseback. The Hunnish bow, the composite bow, was notable for being capable of ease of use from horseback. Don't think any culture other than the Japanese developed a longbow/greatbow capable of being used from horseback.