A second set of trenches dug for training purposes during World War I has been investigated by experts in an area that saw intensive use in wartime.

The line of three trenches lies about two miles from where other remains were found to have survived in a field in Ross-shire last year.

The Royal Commission on Ancient and Historic Monuments of Scotland (RCAHMS) have investigated the site.

The farmer has never ploughed the field preserving the system for decades.