This lore can be found on Hoth.
The Republic finds itself in the worst possible military position on Hoth as it battles both Imperial forces and White Maw pirates. Each of these enemies poses significant individual challenges; combined, they are a nightmare scenario for Republic war strategists. It appears impossible to adopt a battle plan that effectively defends against both, much less offers any hope of victory over them. The Empire employs classic high-aggression tactics while protecting its units within heavy fortifications, while the unpredictable White Maw pirates favor hit-and-run attacks that take advantage of Hoth’s natural landscape for maximum effect. Should these two enemies ever join forces, the Republic’s survival on the planet would likely be measured in hours.