Yes, it is a must to have March PU before any of the 2 released CU's. You should slipstream March PU but you cannot natively slipstream a CU in 2013 so far.
Trying to slipstream both March PU and any CU using the Native installer doesn't give you the result you expect.
The solution is to slipstream March PU by extracting its contents in 2013\SharePoint\Updates and put the CU .exe (extract from zip only) in 2013\Updates.
Trying to slipstream both March PU and any CU using the Native installer doesn't give you the result you expect.
The solution is to slipstream March PU by extracting its contents in 2013\SharePoint\Updates and put the CU .exe (extract from zip only) in 2013\Updates.