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April 1918
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Foch is officially promoted to General-in-Chief of the Allied Armies, giving him the authority he needs to move French units to the Lys. Petain keeps the right to appeal to the French government until June.
The Wickes class destroyer USS Ringgold (DD-89) and USS Mugford (DD-105) are launched at the Union Iron Works of San Francisco. Neither is commissioned in time for service in the First World War. The Ringgold served with the Royal Navy in the Second World War as HMS Newark. The Mugford served as a seaplane tender in the period immediately after the First World War.