As Russian tanks and trucks rumbled close to their village, a Ukrainian teenager and his father stealthily launched their small drone into the air.
Working as a team, they took bird's-eye photos of the armoured column moving toward Kyiv and pinpointed its coordinates, swiftly messaging the precious information to the Ukrainian military.
Within minutes, artillery batteries rained shells down on the invading forces, with deadly effect.
Andriy Pokrasa, 15, and his dad, Stanislav, are being hailed in Ukraine for their volunteer aerial reconnaissance work in the early days of the invasion, when Russian troops barrelling in from the north made an ultimately failed attempt to take the capital and bring the country to its knees.