They never had a chance. Fumbling blindly through cratered farms, the troops from Russia’s 155th Naval Infantry Brigade had no maps, medical kits or working walkie-talkies, they said. Just a few weeks earlier, they had been factory workers and truck drivers, watching an endless showcase of supposed Russian military victories at home on state television before being drafted in September. One medic was a former barista who had never had any medical training. Now, they were piled onto the tops of overcrowded armored vehicles, lumbering through fallow autumn fields with Kalashnikov rifles from a half-century ago and virtually nothing to...