Final answer:
The Emancipation Proclamation left unanswered how it would be enforced. A military order or directive from President Lincoln would provide details on how the Union army would enforce the proclamation.
Step-by-step explanation:
The Emancipation Proclamation didn't address the question of how it would be enforced. A document that might help answer this question is a military order or directive from President Lincoln explaining the specific actions that should be taken to enforce the proclamation. This document would provide details on how the Union army would ensure that the enslaved individuals were freed and protected.