"The Group" according to a rapper

As I started reading, I was soon struck and carried away by the extraordianry beauty of the style and it didn't take long for me to start humming the rhyme like Eminem spitting fire. The Group is a very fine English text, period. It was after perusing the reaction of everybody else in the class that I turned critical to the vagueness of the play. I share the sentiment of many in the class that this text is too poetic and obfuscate for readers to reasonably grasp what is going on in each scene. I put some effort to visually reconstruct the scene--I paid a close scrutiny to the ending, trying to decipher the message. It seems that Patriots are massacred by the British: "[i]nstead of the gay landscape's beauteous dyes," I understand this line as the grasses covered by blood; "[t]o make a covert for their country's friends, [d]enied a grave!" I understand this line as the fallen soldiers lying on the ground; "[t]hen over the purpled plain the victors tread [a]mong the slain to seek each patriot dead." This clearly suggests the defeat of American in the battle, I can't think of any other interpretation. But, well, what does it mean here?

Apart from the undeniable aesthetic value, I felt very ambiguos about what to take from the text. This play is published in 1775, before the Declaration of Independence--was there a major battle between the British and the colonists before the date? Is this play refering to any particular historical battle? I am no expert of American history and I feel somewhat puzzled. Other than that, I think this play is a beautifully composed satire worth attention. My conclusion for now: I probably need to go back to read the text feeling more like a historian and less like a rapper.