In 1939 two M-class cruisers and two H-class battleships were laid down and parts for two further H-class battleships and three O-class battlecruisers were in production. The strength of the German fleet at the beginning of the war was not even 20% of Plan Z. On 1 September 1939, the navy still had a total personnel strength of only 78,000, and it was not at all ready for a major role in the war. Because of the long time it would take to get the Plan Z fleet ready for action and shortage in workers and material in wartime, Plan Z was essentially shelved in September 1939 and the resources allocated for its realization were largely redirected to the construction of U-boats, which would be ready for war against the United Kingdom more quickly.