Space weapons are weapons used in space warfare. Artillery dominated the battlefields of trench warfare. These weapons were transformational for European warfare. These are one of the USSOCOM's main weapons for waging unconventional warfare and counter-insurgency. Boko Haram retreated to guerilla warfare tactics. The key portion of training involved learning hit and run tactics of guerrilla warfare. Fortifications are military constructions and buildings designed for defence in warfare. Military animals are creatures that have been employed by humankind for use in warfare. This directly inspired the development of modern guerrilla warfare. The havoc included battles, sieges, early biological warfare, and massacres. Pirates were often former sailors experienced in naval warfare. The role of churchmen was analogous with that of the warriors waging heavenly warfare. Intelligence gathering through infiltration, guerrilla warfare, and pilot rescue. A period of unrest with city guerrilla warfare called the Bersiap period ensued. The German military searched for ways to apply this in the face of trench warfare.