You may be looking for March 5.

The Fifth of March is a 1993 novel about the Boston Massacre

Boston Massacre

The Boston Massacre, called the Boston Riot by the British, was an incident on March 5, 1770, in which British Army soldiers killed five civilian men. British troops had been stationed in Boston, capital of the Province of Massachusetts Bay, since 1768 in order to protect and support...

 (of March 5, 1770, pre-Revolutionary War) by historian and author Ann Rinaldi

Ann Rinaldi

Ann Rinaldi is an American young-adult fiction author. She is best known for her historical fiction, including In My Father's House, The Last Silk Dress, An Acquaintance with Darkness, A Break with Charity, and Hang a Thousand Trees with Ribbons...

, who was also the author of many other historical fiction novels such as Girl in Blue

Girl in Blue

Girl in Blue is a 2001 novel by Ann Rinaldi. It is a historical fiction which takes place during 1861, during the American Civil War.-Synopsis:...

 and A Break with Charity

A Break with Charity

A Break with Charity: A Story about the SaleWitch Trials is a novel by Ann Rinaldi released in 1992, and is part of the Great Episodes series.-Plot synopsis:...

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This book is about a fourteen year-old indentured servant named Rachel Marsh who finds herself changing as she meets many people, including young Matthew Kilroy, a British private in the 29th regiment. She has a friend named Jane, who was her first ever friend.

Plot

Rachel Marsh helps a young British Private, Matthew Kilroy, and continues to help him even after he is sent to jail for murder. During the cold winter in Boston, she sneaks food from the dinner table to Matthew. One day her friend Jane comes to her bedroom window, tells her to get dressed and follow her. In the center of Boston there were massive riots against the British soldiers, guns are being fired and people are being killed. In particular, in self defense, Matthew Kilroy shoots a Bostonion. In the meantime, Rachel is being swept away by the crowd and has lost Jane. She visits the book keeper, Henry Knox. Rachel wants the Adams' to know nothing of her being there as that could loose her her position. Later in the book she has to tell Mr. Adams because she wants him to do the right thing for Matthew. Mr. Adams is angry, but understands why she did it. While Matthew was in jail, she secretly brings him food. This, Mr. Adams doesn't really like. She wants the people she works for, John Adams, to help him and 6 other soldiers out of jail, but that would ruin his career. In the end John Adams does help the soldiers, but two of them including Matthew are accused of manslaughter. Matthew is branded and shipped back to England. Matthew proposes matrimony to Rachel but she refuses him. Mr. Adams feels that it would be best to let go of Rachel when they move back to Braintree. He gets Rachel a position in Pennsylvania that he thinks would suit her. She is about to start a new chapter in her life and wants to be heard in any way she can.