He was quite harsh towards prostitutes. He cut their hair off and forced them to leave Giresun. Those who couldn't would drown in the sea. In January 1920, Osman Ağa started publishing the newspaper Gedikkaya. In February 1920, six British battle ships came close to Giresun, but prevented by Osman Ağa from landing. British commander invited him to ship to meet, but Osman Ağa understood that it was a trap and didn't go. British ships went off after a British soldier attacking a girl and getting wounded by his foot. In March 1920, Osman Ağa captured a powerboat coming from Greece and took everything inside; which was 1800 Turkish liras, 700 Russian silvers, 600 American dollars and 400 jerry cans. All of these were sent to Association for Defence of National Rights. The powerboat was used during the Turkish War of Independence. He later executed a pro-Pontic agency clerk named Yorgi as well as two Greek doctors who malpracticed Turkish patients. He arranged a meeting and after the meeting; he, along with the people who joined the meeting, forced the Greek metropolitan to pray for Turks. Later, a postman named Atmacidi was also executed for spreading Greek propaganda. He took part of shipping weapons from Soviet Union and sending these to the Western Front. He sold hazelnut and wine to Soviets and bought weapons from them. He received an order to go to Amasra due to the ongoing revolt in Düzce. However, his contribution to the suppression of the rebellion is unknown. He sent a battalion, consisting of 1050 men from Ordu, Giresun, Görele, Tirebolu and Akçaabat, to Eastern Front but the battalion joined at the end of the fight. Nevertheless, the battalion stayed there for 4 months, ultimately to return to their home in January 1921. According to non-Turkish reporters and historians, he was cruel towards Greek civilians as well. According to Mustafa Kemal's recent biographer Robert Shenk of the US Naval Institute, Topal Osman was a sadistic ethnic cleanser of Armenians and Greeks." Osman along with his militia forces, were responsible for massacres, deportations, destruction and confiscation of property, extortion, rapes and other atrocities throughout this region including the cities, towns and villages of Samsun, Marsovan, Giresun, Tirebolu, Ünye, Havza and Bulancak. He was however refused arms and cooperation by the government and inhabitants of Trabzon. According to Bruce Clark, it was because in Trabzon multicultural pro-Ottoman ideals