Captured by the Red Army during the Soviet invasion of Poland, he was murdered in the Katyn massacre, on April 9, 1940.

In November 1918 Solski joined the newly created Polish Army and fought in the Polish-Soviet war of 1920, in which he was an officer in the headquarters of 9th Infantry Division.

In summer 1939, Solski was mobilized to the Reserve Center of 14th Infantry Division, with which he fought in the German invasion of Poland.

In late September 1939, Solski was captured by the Red Army while attempting to escape occupied Kresy and flee to Hungary.

His diary, which was kept until very last moment before the execution, is regarded as one of the most accurate records of life as a prisoner of war of the Soviets, as he described everyday events at the camps.

Solski was survived by his wife, Anna Leontyna née Trojanowska (1906–1970), whom he married in 1926, and a daughter Ewa, who died in 2010.