A successful rush usually attempts to disrupt the resource gathering of the defending player or annihilate that player entirely. The rush is a risky tactic. If the rush is successful, then the player may have won the game or significantly set his or her opponent back; if the rush fails, then the rushing player may have lost valuable time and resources that would have been better spent on research, building defenses, and building more powerful units. A rush can also be considered a mass attack with primarily only one type of unit used, and depends on overwhelming numbers and force to succeed. The rush is often a suicidal attack (for the units involved); rushing units are often expected to die, but to nevertheless benefit the player initiating the rush by disrupting the opponent's operations.