In December 1851 and under the pretext of abolishing slavery, the British bombarded Lagos, dislodged Kosoko from the throne, and installed a more amenable Akitoye as Oba of Lagos. Though Akitoye signed a treaty with Britain outlawing the slave trade, Tinubu subverted the 1852 treaty and secretly traded slaves for guns with Brazilians and Portuguese traders. Further, she obtained a tract of land from Akitoye which now constitutes part of the present-day Tinubu Square and Kakawa Street. Later, a conflict developed between Tinubu and some slave traders including Possu, a Kosoko loyalist. Consequently, Possu, Ajenia, and other traders tried to instigate an uprising against Akitoye because of Madam Tinubu's influence in Lagos. In the interest of peace, Benjamin Campbell, the British Consul in Lagos, asked Akitoye to exile Tinubu. After Akitoye died, Tinubu returned to Lagos and gave her support to his successor, Dosunmu. Under Dosunmu's reign Tinubu had a massive security force composed of slaves and she sometimes executed orders usually given by the king. As a result, Dosunmu grew wary of her influence in Lagos. A new development was the colonial government's support for the return of repatriated captives (mostly of Yoruba heritage) to settle in Lagos. Many of the returnees, also called Saro, were favored by the British in commerce and soon began dominating legitimate trade in Lagos.