Men and items are rated for how much they weigh, and how much they can carry, walking, riding or flying.
weight walking riding flying
------ ------- ------ ------
man 100 100 - -
riding horse 300 150 150 -
wild horse 300 self self -
warmount 300 150 150 -
knight 400 100 100 -
elite guard 400 100 100 -
ox 1000 1500 self -
winged horse 300 150 150 150
`man' includes all of the varieties of men, including peasants,
sailors, workers, etc. as well as nobles. A knight includes both the
man and the horse, hence the 400 weight.
In order to ride, the total riding capacity must cover the weights of all the units that may not ride themselves.
Examples:
ride capacity is 150 - 100 = 50 walk capacity is 250
ride capacity is 150 - 100 = 50 walk capacity is 250
The wild horse can walk or ride on its own, but will not carry anything.
ride capacity is 150 - 100 = 50 walk capacity is 1750
The ox may be driven alongside the horse, but will not carry anything when moving so quickly.
A stack will ride if there is enough riding capacity to carry all of the non-riders. Otherwise, the stack will walk.
In order to fly, the total flying capacity for the stack must cover the weights of all units that can not fly themselves.
Stacks which are overloaded beyond their walking capacity will travel slower than normal. A stack loaded at 150% of its walking capacity will take 50% longer to traverse a route. Stacks overloaded to over 200% of walking capacity may not travel at all.
Weights and capacities are always considered for the stack as a whole. One unit may have all the men, and another unit may have all the horses. If they are stacked together, the distribution of items across units is irrelevant.