An offensive operation conducted with a minimum of advanced planning is?

An offensive operation conducted with a minimum of advanced planning is often referred to as a "spontaneous" or "opportunistic" attack. This type of operation relies on the immediate assessment of the battlefield and the ability to exploit unforeseen opportunities, typically emphasizing speed and surprise. While it can catch the enemy off guard, such operations may also risk coordination and resource management issues due to the lack of thorough pre-planning.