Although sturdy, accurate, and very effective, the Ju 87 was vulnerable to modern fighter aircraft, like many other dive bombers of the war. Its flaws became apparent during the Battle of Britain; poor manoeuvrability, lack of speed and defensive armament meant that the Stuka required a fighter escort to operate effectively. The Stuka operated with further success after the Battle of Britain, and its potency as a precision ground-attack aircraft became valuable to the German war effort in the Balkans Campaign, the African and Mediterranean Theatres and the early stages of the Eastern Front campaigns.