There are many synonyms for the phrase "came from sides", which can be used to convey the same meaning in different contexts. Some of these synonyms include "approached from the flanks", "emerged from both sides", "advanced from the left and right", "arrived from lateral directions", "came in from opposite directions", "converged from two sides", and "moved in from both flanks". These phrases can be used in a variety of situations, such as describing the movement of troops on a battlefield, the appearance of wildlife in a forest, or the arrival of unexpected guests at a dinner party. Choosing the right synonym can add depth and nuance to your writing, and help you to convey your message more effectively.