The American steamer Chattahoochee, formerly the German Sachsen, was sunk off the English coast on March 25.
The Spanish steamers Arpillao and Begona were sunk March 25.
The Italian steamer Alessandra was sunk off the Island of Madeira April 2.
The Ministre de Smet de Naeyer, a Belgian relief ship, was sunk in the North Sea on April 6, and twelve members of the crew were lost.
As a result of the commercial agreement between Spain and the United States, German submarines began a blockade of Spanish ports, April 11.
Because a German submarine had captured a Uruguayan military commission bound for France, the Government of Uruguay on April 11 asked Berlin, through Switzerland, whether it considered that a state of war existed with Uruguay.
CAMPAIGN IN WESTERN EUROPE
March 18—Belgians repulse German raids in the region of Nieuport, Dixmude, and Mercken.
March 19—French penetrate German line near Rheims; British carry out successful raids in the neighborhood of Villers-Guislain, La Vacquerie, and Bois Gienier.
March 20—German airplane drops balls of liquefied mustard gas on American lines northwest of Toul; Americans shell Lahayville, causing a heavy explosion and forcing the Germans to retreat; French repulse violent raids in the Souain sector of Champagne.