Concerning battles there is some evidence regarding arab participation with spears and I have selected one in particular as interesting in this regard~
See below; In 1529, Imam Ahmad's Adal troops defeated a larger Ethiopian contingent at the Battle of Shimbra Kure. The victory came at a heavy cost but it solidified the Adal forces' morale, providing proof that they could stand up to the sizable Ethiopian army.
See also
https://en.wikipedia.org/wiki/Battle_of_Shimbra_Kure