Mećeva joined Yugoslav People's Liberation War in early 1941. In the first battles that took place in Aginci and Komlenac, he emerged as one of the bravest fighters of the Second Krajina (Kozara) Detachment. His courage stands out in battles on the mount Kozara, near Podgradci, Mrakovica and Turjak as well as near Gradina and Jasenovac. Also, he fought in conflicts on the Prijedor–Banja Luka railway.
