active shooter events are often over in 10 to 15 minutes In police training manuals, the police response to an active shooter scenario is different from hostage rescue and barricaded suspect situations.[3][4] Police officers responding to an armed barricaded suspect often deploy with the intention of containing the suspect within a perimeter, gaining information about the situation,
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The Sino-Japanese war happened first in Aug 1, 1894 – Apr 17, 1895The Russo-Japanese war happened next in Feb 8, 1904 – Sep 5, 1905
The Japan officially annexes Korea is last in 1910
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