The Polish coup d'état attempt in Lithuania refers to a failed attempt by Polish statesman Józef Piłsudski to overthrow the existing Lithuanian government of Prime Minister Mykolas Sleževičius, and install a pro-Polish cabinet that would agree to a union with Poland. The Polish intelligence agency, the Polish Military Organization (PMO) was to carry out the coup d'état, planned to be implemented in August 1919. The coup was designed to seem to be an initiative by local Lithuanians aiming to free their government of German influence. The PMO hoped to rely on the assistance of sympathetic Lithuanian activists. They were thwarted by the lack of cooperation and the unwillingness of sufficient number of Lithuanians to support the Polish cause.