Foreign mercenaries

"The Transsahelian Kingdom badly lacks well-trained professional soldiers, and is often forced to use the help of foreign mercenaries. Renegades from every country in the world, adventurers looking for wealth and glory in Africa, runaways, outlaws or idealists, failed revolutionaries... hardened by years of war and wandering, they are a strong, experienced infantry. Since they do not need training, their recruitment is very fast, but costs lots of gold."