Defense refers to the act of protecting oneself or one's group from an attack or threat. In the context of warfare, it involves measures taken to prevent enemy forces from advancing or taking control.
Related terms
Fortification: Fortification refers to the construction of defensive structures such as walls, trenches, or bunkers to strengthen a position and make it harder for attackers to breach.
Entrenchment: Entrenchment is when soldiers dig trenches or build protective barriers on the battlefield to create fortified positions that offer cover and protection.
Siege: A siege occurs when one force surrounds and isolates another force within a location, cutting off supplies and reinforcements in an attempt to force surrender.