However, he failed to find a permanent post in America and in 1944 received the terrible news that his third son Mathieu had been killed in the war. Hadamard left the United States soon after and spent a year in England before returning to Paris as soon as was possible after the end of the war.
Hadamard kaliwa ang Pilipinas sa lalong madaling panahon pagkatapos at nagastos sa isang taon sa England bago sa pagbalik sa Paris sa sandaling ay posibleng matapos ang katapusan ng digmaan.