The influences of the Assassins had spread throughout the ages due to the results of the actions of Altair Ibn-La'Ahad , Ezio Auditore da Firenze many years ago. Not much is known about how or when the Brotherhood was formed. Sometime between 1501 and 1503, the Italian Assassin Ezio Auditore da Firenze sent a group of Assassins to find a map to the New World, and they decided to establish a presence in the colonies before the Templars did.

It is the late 16th century. The time when settlers started settling in the new world , the assassin brotherhood was established by Ah Tabai, the Mentor of the Caribbean Assassins, was known to have had several contacts with Assassins in the British colonies. Around 1740, Ah Tabai sent his student Achilles Davenport to establish a Brotherhood in the North American colonies. There, Achilles met John de la Tour, an Acadian Assassin operating on behalf of the French Assassin Council. De la Tour was attempting to build a network of information which would help identify threats against the colonies. De la Tour theorized that the New World would contain various Precursor sites and artifacts.

Nothing Is true , Everything is permitted
Stay your blade from the flesh of an innocent
Hide in plain sight, be one with the crowd
Never compromise the Assassin Brotherhood

This is the laws I ounce lived by , I was a young man at that time , I am Earl Ashford born to English immigrants to NY and this is my story. I was brought to the Colonial Assassins after the death of my parents by a childhood friend Jaden O'Brien where we served under the Mentor Achilles Davenport.
Over the first four years in the assassin brotherhood Earl had fully devoted himself to 'the creed' serving dutifully. However, he still pondered the ambiguous areas between the motives of the Assassins and those of the Templars, their sworn enemies. Over time, he voiced these doubts to his closest friend Jaden often calling him Jay about the morality of the Assassins' actions and the Creed, as well as the increasingly tight control their Mentor was placing on them. When not on missions Earl is often seen training his skills of marksmanship , swordplay , tracking and stealth.

While on a mission in the North Atlantic Earl and Jaden was told to scout the area. Earl then tries to get a drop on him pouncing on his friend from a tree and misses. Jaden then laughs and talks to his friend " almost got me there "
" Almost ? , well next time I will pin you " Earl responds.
" there is no next time "
" That is something we do for ourselves " Earl finally says.
Earl and Jaden came across one of their assassin comrades , who was supposed to meet with smugglers carrying valuable cargo. When the smugglers were intercepted and captured by the Royal Navy, Earl infiltrated the smugglers' camp, eliminated the British guards, and commandeered their ship, a warship named the osprey.