The question isn’t complete...
Russia was not invincible as it had appeared during the Napoleonic wars. shattered concerts of Europe instability
Answer:
Yielding to political pressure, Brig. Gen. Irvin McDowell led his unseasoned Union Army across Bull Run against the equally inexperienced Confederate Army of Brig. Gen. P. G. T. Beauregard camped near Manassas Junction.
Explanation:
Succeeding or future generations collectivity.