When Ndawa , a professional warrior attacked the territories of Nyagua's fathcr in the Upper Mende region, Nyagua called for assistance from his Kono vassals. Matturi responded swiftly by mobilizing his Kono warriors on behalf of Nyagua. He was put in charge of all the fighting forces, and he carried out his task effectively, returning with spoils of victory for Nyagua. Nyagua rewarded Matturi by giving him all of Southern Kono and by promising to protect the region from enemy attacks.
With peace and stability in the region, those who had fled returned and Matturi urged his people to re-build the town. This move towards reconstruction was abruptly interrupted when Samori Toure's Sofa warriors attacked Kono in 1893 and occupied Tecuyama and Levuma. Matturi immediately informed Nyagua who, in turn reported to the Governor that his country had been invaded. However, by the time the British sent in their troops to repel the invaders, Matturi with the assistance of Nyagua had already succeeded in driving the Sofa warriors from Kono.
Matturis’ military success in defeating Samori Toures warriors greatly enhanced his reputation both among his subjects and the Freetown-based Colony Government. Thus, when the Protectorate was declared in 1896, Foamansa Matturi was crowned the first Paramount Chief of Jaiama Nimikoro.
During his rule, Foamansa Matturi initiated several development projects in his chiefdom, and the British authorities commended him for embarking on a road construction project linking Jaiama to the other main towns in the Kono District. Foamansa Matturi died at a ripe old age in 1936.