Which development caused the british to declare the proclamation of 1763

i'm not sure i understand what you are trying to ask, if you give more information, that would be most .

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.