Pope Urban II in the year 1095.
To regain the Holy Land from the Muslims.
Pope Urban II called for the crusade against the holy land.
The first crusade started because the Christians wanted to regain the holy land of Jerusalem from the Muslims.
Crusade
He called for the initiation of a Crusade to take back the Holy Land from the Muslims.
A crusade.
The Muslims.
10000
the Muslims took over the holy land
there tactics were to get the holy lands back and to win the crusade.
I presume you mean The Crusades. The Crusades were Holy Wars in the 11th to 13th centuries waged by Christians from western Europe to regain the holy city of Jerusalem from the Muslims. The First Crusade succeded, but Jerusalem was subsequently regained by the Muslims, and the later Crusades failed to regain it.
The Holy Land was under the control of the Muslims and he wanted to return it to the Christians, so the Pope called for a crusade.