- opogjijijp
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The number and type of ships at Sigma Octanus may provide a decent comparison. First they sent in a carrier, destroyer, and two frigates, encountered resistance, and then returned with a much larger fleet. Anyone want to check the size/composition of the fleet they came back with?
The sneaky little probe that attached itself to the Iroquois lead the Covenant to Reach, the artefact on Sigma IV held the location of Halo, which is how Cortana found it in the first place.
The artifact held both the location of Halo and Reach. Cortana uses some of the information on it to find Halo, and Ackerson(and later Halsey) discovers some of the information on it points to Reach. I believe this is also confirmed in an interview somewhere with Eric Nylund/Trautmann.
The way I've seen is that the probe let the Covenant know that Reach was a Human held world, and the artifact let them know there was important forerunner stuff to be found.
[Edited on 04.12.2011 6:54 PM PDT]