The northern part of (Brit) Cameroon joined with Nigeria while the southern part opted for (French) Cameroun in 1960. I know a Bn of the Grenadier Guards were flown there to quell some minor disturbances, they were later relieved by an English Line regiment, the KORB I think.
Try their Regimental web sites for information on that country in the era you are interested in from an infantryman's point of view.