Muslims have fought in numerous conflicts (and on multiple sides of quite a number of those conflicts). Reasons for their fighting vary from religious to political to economic to ideological to social to sociological reasons, with many other possibilities. To narrow the focus of the question, please re-submit the question giving (1) a time-period, (2) location, and/or (3) a specific group of Muslims.
what was u.s grant motivation
No. Neither of them are fighting "the Muslims" as a group. Most Palestinians are Muslims anyway. The Israeli-Palestinian Conflict is between two national groups: Israelis who are primarily Jewish against Palestinians who are primarily Muslim. However, neither Israeli nor Palestinian forces have declared that they are fighting Islam. There are numerous mosques in both countries where Muslim worshipers freely pray to God.
the crusaders were fighting muslims to capture the holy land of Jerusalem.
guru nanack was fighting jews and muslims
Muslims
Muslims vs christians
The crusaders were Catholic, mainly fighting Muslims.
They were fighting over land and wealth.
The Crusades were fought by the Christians and the Muslims.
Jews and Muslims
muslims
Because of their different idealism