<Tr> <Td> German ultimatum to Lithuania </Td> <Td> Mar. 1939 </Td> </Tr> <Tr> <Td> British guarantee to Poland </Td> <Td> Mar. 1939 </Td> </Tr> <Tr> <Td> Invasion of Albania </Td> <Td> Apr. 1939 </Td> </Tr> <Tr> <Td> Pact of Steel </Td> <Td> May 1939 </Td> </Tr>

Where did the german invasion of poland take place