Watchguard, Gateway, models:

Firebox FireboxTM System 4.6	User Manual
Firebox SSL Core	Hardware Manual Installation Instructions
Firebox SSL Series	User Manual
Firebox X Core 1250e Firebox X Peak 5500e	Quick Start Manual
Firebox X Peak Series	Quick Start Manual
Firebox X Series	Quick Start Manual
Firebox X1000	Hardware Manual Install Manual Reference Manual User Manual Quick Start Manual
Firebox X1250E	Hardware Manual Quick Start Manual
Firebox X15	Quick Start Manual User Manual
Firebox X20E	Reference Manual User Manual Quick Start Manual
Firebox X5000	Hardware Manual Quick Start Manual
Firebox X5500E	Reference Manual
Firebox X55E-W	Hardware Manual
SSL 1000	Hardware Manual User Manual Setup Manual
SSL 560	Hardware Manual Quick Start Manual