Melanchthon reproached Gallus for fighting continually against the Evangelicals, instead of combating Romanism. However, during the diet in 1556, Gallus preached against the Roman Catholics, and there are still extant manuscripts containing theses of disputation against the Ingolstadt Catholics. In this connection may be mentioned  Gallus' writing directed against Corpus Christi day: "Vom abgöttischen Fest, Frohnleichnams-Tag genannt" (1561). He died in Bad Liebenzell.