Fieldcraft is a tactically advanced, strategical military skill to operate stealthily and the methods used to do so, which can differ during day or night and due to weather or terrain. These skills include camouflage, land and water navigation, understanding the difference between concealment from view and cover from small arms' fire, using the terrain and its features to mask ground movement, obstacle crossing, selecting good firing positions, lying up positions, camping positions, effective observation, camouflage penetration, countersurveillance, detecting enemy-fire directionality and range, survival, evasion, and escape techniques.