A Mumford curve \(Y\) (over a nonarchimedean field \(k)\) has an admissible covering \({\mathcal U}\) by affinoid subsets of \(\mathbb{P}^1(k)\). Given a morphism \(\varphi : X \to Y\) of degree 2 of nonsingular projective curves over \(k\), the author describes the reduction of \(X\) with respect to \(\varphi^{-1} ({\mathcal U})\); he also lists all possibilities if \(Y\) has genus 2 and \(\varphi\) is unramified. The reviewer found no less then 28 misprints on these 7 pages!