Final answer:
The statement that Donalbain and Malcolm unite in England to defeat Macbeth is false; Malcolm raises an army in England to challenge Macbeth, while Donalbain flees to Ireland and does not participate in Macbeth's defeat.
Step-by-step explanation:
The assertion that Donalbain and Malcolm come from England to defeat Macbeth together is false. In Shakespeare's play Macbeth, after the murder of their father King Duncan, Malcolm and Donalbain flee to England and Ireland, respectively, for safety. This strategy is to avoid being murdered themselves as suspects or targets, given the close proximity to the throne. It is Malcolm who later gains the support of the English king and raises an army to challenge Macbeth. Donalbain, however, is not mentioned to have returned with Malcolm to confront Macbeth.