Which is the correct order of events that occurred after Austria-Hungary declared war on Serbia? Russia mobilized its forces, prompting Germany to declare a two-front war against Russia and France. France mobilized its forces, prompting Germany to declare a two-front war against France and Russia. Germany mobilized its forces, prompting Russia and France to declare war against Germany and Austria-Hungary. Austria-Hungary mobilized its forces, prompting Russia and Germany to declare war against Austria-Hungary and France.