The Holiday Inn, a ten-story yellow building where foreign journalists and Bosnian Serb officials were staying, stood across the street. Gunmen inside opened fire on the crowd, wounding at least a dozen people.2 The crowd rushed the building, swarmed through the floors, and found a man in the cellar with a rifle.2
For 1,395 days, snipers in the towers and apartment blocks of Sarajevo shot civilians crossing streets, riding trams, collecting water, attending funerals.10
In a built-up area, closely packed buildings cut ground-level observation and fields of fire to less than 100 yards.1 Three movement routes existed only in cities: underground through sewers and subways, at surface level through buildings, and above ground through walls. Mouseholing, the technique of blowing holes between adjacent buildings, was used by the Germans at Stalingrad and by both sides in every urban battle that followed.1
Concealment in a city did not look like concealment in the field. Charles Whitman walked to the observation deck of the University of Texas tower in 1966 wearing coveralls. “To the surrounding people he looked like a janitor.”2 Vasily Zaitsev was a naval payroll clerk before he became a sniper at Stalingrad.2 The IRA sniper team in South Armagh fired from the back of a modified Mazda 626 hatchback.11 John Allen Muhammad and Lee Boyd Malvo fired through a hole cut in the trunk of a 1990 Chevrolet Caprice.8
In Baghdad in 2006, an insurgent sniper cell filmed its own attacks from modified vehicles and released the footage as propaganda.2 The U.S. military deployed gunshot-detection systems and counter-sniper teams in response, and the shootings continued.2
Today, drones fly persistent surveillance over combat zones in Ukraine. CCTV and license plate readers track vehicles across entire cities. Mobile phones place a person at a specific location at a specific time. A concealed position that no camera, drone, or phone can observe is harder to find than at any point in the record. The rest of this series examines what that changes.