 It was not until 1965 that recruitment of fighters increased along with popular support , and the strike teams were able to increase in size . The increase in popular support was in part due to FRELIMO agencies ' offer of help to exiled Mozambicans , who had fled the conflict by travelling to nearby Tanzania . Like similar conflicts against the French and United States forces in Vietnam , the insurgents also used landmines to a great extent to <unk> the Portuguese forces , thus straining the armed forces ' infrastructure and <unk> soldiers . 
