The Battle of Grand Gulf was fought on April 29, 1863, during th: Nonetheless, this attrition has mostly affected dialectal variation in grammar and vocabulary. In fact, only 3% of the English population actually speak RP, the remainder speaking in regional accents and dialects with varying degrees of RP influence.[262] There is also variability within RP, particularly along class lines between Upper and Middle-class RP speakers and between native RP speakers and speakers who adopt RP later in life.[263] Within Britain, there is also considerable variation along lines of social class; some traits, though exceedingly common, are nonetheless considered "non-standard" and associated with lower-class speakers and identities. An example of this is h-dropping, which was historically a feature of lower-class London English, particularly Cockney, and can now be heard in the local accents of most parts of England. However, it remains largely absent in broadcasting and among the upper crust of British society.[264]