Is it true that Ashwatthama saved Karna from Arjun?

Is it true that Ashwatthama saved Karna from Arjun? Yes. Ashwatthama saved the life of Karna from Arjuna not once, but 3 separate times. First instance - Then Dhananjaya, with eyes red in wrath, aiming at Karna, quickly sped a shaft like the Destroyer urging forward Death's self. That shaft shot from Gandiva, like Garuda in the welkin in quest of a mighty snake, quickly coursed towards Karna. The son of Drona, however, that mighty car-warrior, with a winged arrow of his, cut it off in mid-air, desirous of rescuing Karna from fear of Dhananjaya. Section CXXXVIII, Jayadratha Vadha parva, Mahabharata. 2. Second Instance - Then Dhananjaya, with great speed at a time, when speed was necessary shot in that battle a shaft of solar effulgence for the destruction of Karna. Drona's son, however, with a crescent-shaped arrow, cut off that shaft as it coursed impetuously (towards Karna). Thus cut off by Aswatthaman, that shaft fell down on the earth. Section CXLIV, Jayadratha Vadha parva, Mahabharata. 3. Third Instance - And he covered Karna himself with clouds of shafts in the very sight of thy son. Thus shrouded with arrows the steedless and driverless Karna, stupefied by that arrowy shower, knew not what to do. Beholding him made carless, Aswatthaman, O king, caused him to ride on his car, and continued to fight with Arjuna