Ruin Zone army clash is the 3rd episode of Super Digimon Xros Wars
At another zone with a flag (that is the same as the Twilight army's flag) then 3 Digimon appear at a giant base and begin talking the giant knight Digimon tells them about the group with an unidentified Digimon saying he has the power to Digi-Xros, and to get rid of them ASAP. Back with Ian and his group, Flamemon and Patamon had just finished drawing a symbol, (Flamemon's head without his eye dots and mouth). Ian who is worried that Jeri is mad, but then CeCe comforts him, Ian just gets better, (Flamemon and Patamon then whisper to each other that Ian has a crush on CeCe.) Maria then tells Gatomon that she is Ian's little sister, Gatomon asks how many years younger she is from Ian, she is only 2 years younger. Then some Pteramons begin to attack Flamemon attacks and wins no problem then another Digimon comes a MailBirdramon comes and tells them about the Dark Knight Army and then leaves, then MegaDigmon comes back with a battle Axe. Ian then says "Digi-Egg of Hope Re-Load" and Patamon armor Digivolves then Ian Dig-Xroses Flamemon and Pegasusmon (It's just Flamemon using the "Hope Sword") and fights of MegaDigmon, then Dorulumon comes and Ian reloads the other Digi-Egg and Digi-Xroses Nefertimon and Dorulumon. They then beat MegaDigmon for good, then Dorulumon leaves and Ian tells Patamon he came up with a name for their army, "Blue Xros Heart" the 5 members like it. Ian then sees the Code Crown.
(Numbers indicate order of appearance. Bolded characters are fought by the protagonists, and italicized characters appear only as a voice or silhouette.)