What kind of power is being expanded when the president sends troops into combat on executive orders without a war declaration?

When a president sends troops into combat without a formal declaration of war, it expands executive power, particularly in the realm of military and foreign affairs. This action often reflects an interpretation of the president's role as Commander-in-Chief, allowing for rapid military response without congressional approval. It raises concerns about the balance of power, as it can bypass the legislative authority granted to Congress in declaring war. This trend has implications for executive overreach and the erosion of checks and balances in the U.S. government.