Bringing troops into besieged city

[Mayfield The Conqueror]

yup always use artillery in border cities or standing armies, never in moving armies. it slows you down

Or carry them in ships.. if you are involved in a campaign along the coast you can keep two armies; one marching along the coast conquering and pillaging, while the other with siege equipment being carried in ships, just land the army next to the city and viola!