In May 1941, the final full-month of the German night offensive, Luftwaffe forces operating against western cities in Britain bombed Dublin, ostensibly in error. Luftflotte 3 regularly operated over North West England, against Liverpool and Manchester. On 31 May 1941, Sperrle's air fleet made a huge navigational error, and bombed the Irish capital, situated some 200 miles from their targets in Liverpool. During May units belonging to the air fleet were involved in the Hull and Nottingham Blitz. A last effort was made against London on 10 May. 571 bombing missions were flown against the embattled capital that night. During the month, Sperrle's men carried out the burden of night operations, flying 2,500 sorties in comparison to 1,300 from "Luftflotte" 2.