Which group invaded the empire of songhail? how were they able to defeat songhai?

After the passing of Emperor Askia Daoud, a civil war weakened the empire, which led the Saadi Dynasty of Marocco to begin an invasion, under the eunuch Judar Pasha. In 1591, at the Battle of Tondibi, the vastly numbered Songhai army, was stomped to death by cattle that was triggered by Saadi's gunpowder weapons.

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.

they wanted the u.s. to fight on the side of the central powers.