Digimon: Data Squad Season 1 Episode 21

Big Panic in the Human World - The Digimon Army Advances

Enraged that Merukimon has not taken proactive action to deal with the human problem, SaberLeomon dispatches a Digimon armada consisting of hundreds of Pteramon and Boarmon, led by Gotsumon, to the human world to destroy it. The DATS step in to contain the threat but are overwhelmed in numbers by the enemy, until the rest of the DATS staff enters the battlefield to help them in the fight. However, both sides are unaware that an unseen third party, lurking in the shadows, has had them all set up in a trap.