During the spring of 1941, active British defenses began to improve. The numbers of antiaircraft guns and searchlights were increased, and in key areas they were radar-controlled to improve accuracy. The problem of guiding interceptors to their targets was partially solved by the introduction of heavily armed Bristol Beaufighters fitted with their own radar. These improvements were reflected in monthly German casualty figures, which rose from 28 in January to 124 in May.
