On 11 November 1918, Poland's independence was declared. Celebrations to mark the occasion were held in Sambor. A few days later, the Ukrainian army entered the city together with the Austro-Hungarian army. There were arrests of legionaries, national activists and intelligentsia. Many people were executed. In the spring of 1919, the legionaries liberated Sambor with a surprise attack. In 1920, when the troops of Semyon Budyonny's 1st Horse Army reached the borders of Sambor County, many young Samborians joined the Polish Army to fight for the freedom of the Fatherland.

In the cemetery in Sambor, there is the Tomb of the Unknown Soldier, where those who died in the struggle to regain independence in 1919-1920 are buried. It is not known how many soldiers lie here and when the monument was erected. The site survived the Second World War and the communist period. In 1989. Poles living in Sambor renovated the monument and placed a plaque on it to honour compatriots murdered by the Soviets during the first Soviet occupation (1939-1941).

It is a tall obelisk topped with a sculpture of an eagle, a cross was placed under the eagle, and plaques with the texts below: "Tomb of the Unknown Soldier. To soldiers killed in combat for Poland's independence. The plaque was laid by grateful Compatriots. Honour to the heroes!" and "Restored on the 50th anniversary of the beginning of the Second World War to honour the sacred memory of the many hundreds of Polish victims of the Stalinist regime, murdered in Sambor in 1939-1941. Honour to the martyrs!".