The best description of the events of the Fourth Crusade is: "Crusaders attacked and subdued Constantinople, never making it to the Holy Lands and further dividing West and East."
The Fourth Crusade (1202-1204) is notable for its diversion to Constantinople, where the crusaders ended up sacking the city in 1204, rather than proceeding to the Holy Land as initially intended. This event deepened the schism between the Eastern Orthodox and Roman Catholic Churches.