Dmitri Mendeleev presented his periodic table of the elements based on increasing atomic weight on March 6, 1869, in a presentation to the Russian Chemical Society. While Mendeleev's table was the first to gain some acceptance in the scientific community, it was not the first table of its kind.
In the end, the British sale of opium was used as means for  obtaining more land and trading rights from the Chinese, leading to  the devastation of the Chinese government and economy which is why  The First Opium War will be remembered in history as the time when  China was ultimately betrayed by the British.
First Battle of Bull Run - Aftermath: In the fighting at Bull Run, Union forces lost 460 killed, 1,124 wounded, and 1,312 captured/missing, while the Confederates incurred 387 killed, 1,582 wounded, and 13 missing. The remnants of McDowell's army flowed back into Washington and for some time there was concern that the city would be attacked.