The Battle of Grand Gulf was fought on April 29, 1863, during th: Since the 15th century, South East England varieties have centred on London, which has been the centre from which dialectal innovations have spread to other dialects. In London, the Cockney dialect was traditionally used by the lower classes, and it was long a socially stigmatised variety. The spread of Cockney features across the South East led the media to talk of Estuary English as a new dialect, but the notion was criticised by many linguists on the grounds that London had been influencing neighbouring regions throughout history.[266][267][268] Traits that have spread from London in recent decades include the use of intrusive R (drawing is pronounced drawring /ˈdrɔːrɪŋ/), t-glottalisation (Potter is pronounced with a glottal stop as Po'er /ˈpɒʔə/) and th-fronting, or the pronunciation of th- as /f/ (thanks pronounced fanks) or /v/ (bother pronounced bover).[269]