Anti-aircraft and airship protection was covered by the four Vickers anti-aircraft guns on the ship. They could be depressed to −5° and elevated to 80°. They had an arc of fire of 360°, which meant that they also could engage any target within their range. Manually operated by only one crewman, they could fire a shell at maximum elevation with a muzzle velocity of . Designed in 1910, each of the guns weighed . After 1916-17 refits two Škoda 7 cm L/45 guns on anti-aircraft mounts were installed. The "Erzherzog Karl" class was also fitted with two above water torpedo tubes, although they were rarely used.