Final Answer:
The invaders who attack the Saxons by land in the passage are not explicitly mentioned.
Step-by-step explanation:
In the provided passage, there is no specific information regarding the invaders who attack the Saxons by land. The passage might not contain details about the identity or origin of the land-based attackers.
It's crucial to carefully examine the passage to avoid making assumptions or providing inaccurate information. Without explicit details, a clear answer regarding the invaders attacking the Saxons by land cannot be derived.