This document highlights how the creation of the Accountability for Maternal, Newborn and Child Health in Nigeria (AMNHiN), a CSO Coalition, has strengthened accountability for maternal, newborn, and child health in Nigeria in very practical ways, and has influenced the health priorities of the President’s Transition Committee in the wake of the March 2015 elections. This case is an excerpt from a collection of twenty two case studies written based on the experiences of the E4A-MamaYe program, which brings to light new learning about the specific ways in which evidence, advocacy and accountability must work together to bring about change. It serves as an excellent example and model for CSOs in GFF Countries that are looking to mobilize and form a coalition.