My brother got me hooked on the TV show Vikings [it's on the History channel, I know nerd alert.] It's all about the Scandinavian Viking history and adventure. They of course add a dramatic flair with love and violence.
Lagertha, a powerhouse of a woman [and ruler], is a Shield-maiden and runs at the lead of many battles. When they fight to the death they use a "shield wall" to protect their army. These studs reminded me of just that, a shield wall.