Welcome Donna,
You will find this community to be supportive & very willing to offer their time to assist where they can.
I see now that you've worked out how to tag your message; that just flags the message to others in the community that are also working in the New Zealand, Australia, Omahu & Hastings topics.
The time frame that these men were tracking Rauparaha could well be during the time of the Maori Wars. After the Australian Eureka Stockade Rebellion was put down 1854, parts of the 2x Military regiments used, were then relocated to New Zealand to subjugate the Maori Nation(s). So you might find so help if anybody is working on those Maori Wars too.