Ukraine has amassed a polyglot arsenal of artillery thanks to donations from its foreign partners. Those howitzers are a key source of firepower and have battered Russian forces for nearly 18 months.

Move over, 88 mm cannon, there is a new big gun in the Flying Heritage Collection. The M55 carries a massive 8-inch (203.2 mm) howitzer. The projectiles for the gun (designated M47) are so big, the ...