Chapter Title and Table of Contents

If I use code such as:

\chapter{Introduction}
\subfile{intro/Introduction}

\chapter{Remaining Work}
\subfile{remaining/Remaining}

The result is:

Chapter 1
Introduction

Chapter 2 
Remaining Work

I'd like to remove the "Chapter 1" etc title, preferably replacing with the number and title.

If I use:

\chapter*{Introduction}

Then the Chapter 1 label is removed, however, this ruins the table of contents - sections are labelled 0.1, 0.2 etc without ever being labelled by chapter.

How can I remove the Chapter N label and keep the numbering on the table of contents correct?