Substitute Able Jallow scored a goal in stoppage time, as Gambia stunned Tunisia by beating Tunisia 1-0 on Thursday, and finished second in Group F of the Africa Cup of Nations in Cameroon.
Gallo hit a powerful ball, followed by Tunisia goalkeeper Bashir Ben Said, who hit the net in the fourth minute of stoppage time for the match.
Gambia, which is participating for the first time in the African Cup of Nations, raised its tally to 7 points in second place, with Mali, the leaders, who won 2-0 against Mauritania, but Mali excels by goal difference.
Tunisia finished third and will face Nigeria in the semi-finals.