Short answers, pulled from the story.
Witold Pilecki and Major Jan Włodarkiewicz founded the Secret Polish Army on the 9th of November 1939. This organization became one of the first underground groups to form after Poland's defeat by Nazi Germany.
The Home Army reached its peak personnel count between 300,000 and 500,000 during summer 1944. The group had numbered about 100,000 members when it officially formed in February 1942 before doubling to roughly 200,000 fighters by early 1943.
Acts of sabotage performed totaled 25,145 instances according to a table of confirmed sabotage actions. These actions included damage to locomotives reaching 6,930 units while derailed transports totaled 732 instances.
Sixteen leaders of the Polish Underground State faced a staged trial in Moscow known as the Trial of the Sixteen on the 5th of May 1945. They received warrants of safety yet were arrested in Pruszków by NKVD on the 27th and the 28th of March after being invited to a conference on entry into Soviet-backed Provisional Government.
The Narodowe Siły Zbrojne brigade liberated prisoners from Holiszowo concentration camp on the 5th of May 1945. This operation freed two hundred eighty Jewish women despite heavy casualties suffered by the unit.