Yn y llythyr hwn, ysgrifenna Charles Newman, perchennog Gwaith Haearn y Gwendraeth, at Richard Janion Nevill Ynad Heddwch o Lanelli, i ofyn am gymorth y milwyr gan ei fod yn ofni y bydd Rebecca yn ymosod ar waith y Gwendraeth y noson honno.

Adysgrif:

'My dear Sir, I have great reason to expect an attack upon our works this night, may I beg of you to send the Dragoons here on their round this night, they will be of great use to the Constables on the works who feel very anxious for ...'