A court has heard how Dale Cregan switched his sights from an "old rival" to the police when he executed a "detailed plan" to lure officers to their deaths in a gun and grenade attack in Greater Manchester. The trial is due to resume on Monday.
The court heard that after this incident Theresa Atkinson repeatedly tried to contact her son Leon's mobile phone and they spoke the next morning.
The prosecution said that straight after that call Leon Atkinson contacted his two brothers and sent a text message to his "old friend" Dale Cregan, who then began making contact with the other defendants alleged to be involved with the Cotton Tree murder.
Livsey, James and Hadfield were being recruited to the plan, hatched by Atkinson and Cregan for revenge.
They decided to exact revenge for the lack of respect shown to Theresa Atkinson and so the shootings at the Cotton Tree were a direct reprisal.
The prosecution told the court that the Short family had been involved in along standing feud with members of another local family, the Atkinsons.
The families had reached a state of uneasy peace following their lengthy dispute. However on May 13 2012 an incident began between Theresa Atkinson, the Atkinson family matriarch, and Raymond Young, a member of the Short family.
Theresa Atkinson was drunk and lashed out with a bottle striking Young. It led to him "back handing" Theresa Atkinson. She responded by shouting "I'm gonna get you done by my sons". She said: "You just wait here, you're dead."
The court was told how Mark Short was buried in Droylsden Cemetery. David Short went on daily visits to the cemetery to be at the grave and grieve for his son. He went with his partner Michelle and their grandchildren - this was not a secret in the community
The prosecution said that on the morning of August 10 David Short did not go to the cemetery. He had some errands to do, so murderers went to his home and killed him there.
He was chased through the house and shot many times. He tried to run around the side of the house to escape. His injuries were already unsurvivable and then a grenade was thrown onto him .
Its explosion had devastating consequences for his torso. It is the first time in this country a military grenade has been used in this way .
Preston Crown Court has been told by prosecution that on September 18 2012 Dale Cregan called in a spurious burglary at Abbey Gardens in Hattersley, luring two unarmed police officers to investigate.
He lay in wait with a glock firearm, the court heard. Pc Fiona Bone and Pc Nicola Hughes attended. As soon as they arrived Cregan shot the officers repeatedly - until his magazine was empty. As he left the scene he threw a grenade towards his victims.